更新QTableWidget上的行会导致分段错误

时间:2012-06-22 23:38:59

标签: qt4 qtablewidget

我已将QTableWidget与totale()广告连接和itemChanged(QTableWidgetItem *)信号相关联,在我的表格中,我正在跟踪第3列和第5列的用户更改。

void Store::totale(QTableWidgetItem *x)
{
    int row = x->row();
    float sum = 0;
    float ttl = 0;
    QTableWidgetItem *item = NULL;
    if (ui->storeTab->currentIndex() == 1)
    {
        if(x->column() == 5)
        {
            item = new QTableWidgetItem;
            sum = ui->itemsTableWidget->item(row, 3)->text().toFloat() * x->data(0).toFloat();
            item->setText(QString::number(sum, 'f', 2));
            ui->itemsTableWidget->setItem(x->row(), 6, item);
            sum = 0;
            for (int i = 0; i < ui->itemsTableWidget->rowCount(); ++i)
            {
                ttl += ui->itemsTableWidget->item(i, 5)->text().toFloat();
                sum += ui->itemsTableWidget->item(i, 6)->text().toFloat();
            }
            ui->totaleBill0->setText(QString::number(sum, 'f', 2));
            ui->ttlBill0->setText(QString::number(ttl, 'f', 2));
        }
        else if(x->column() == 3)
        {
            item = new QTableWidgetItem;
            sum = x->data(Qt::DisplayRole).toFloat() * ui->itemsTableWidget->item(row, 5)->text().toFloat();
            item->setText(QString::number(sum, 'f', 2));
            ui->itemsTableWidget->setItem(x->row(), 6, item);
            sum = 0;
            for (int i = 0; i < ui->itemsTableWidget->rowCount(); ++i)
            {
                ttl += ui->itemsTableWidget->item(i, 5)->text().toFloat();
                sum += ui->itemsTableWidget->item(i, 6)->text().toFloat();
            }
            ui->totaleBill0->setText(QString::number(sum, 'f', 2));
            ui->ttlBill0->setText(QString::number(ttl, 'f', 2));
        }
    }
}

我的问题是如果我在第5列进行更改,它工作正常,但当我在第3列进行更改时,我得到分段错误。

1 个答案:

答案 0 :(得分:1)

尝试在添加新行时断开cellChanged(int,int)信号(断开连接并连接它)。通过这种方式,您将无法从未填充的单元格中读取